I don't think it should be a big problem if people are motivated by their faith to go and do something good, they should be allowed to just do that.

You can't stop people who are motivated, who are affected by something that is wrong. If they believe that something is wrong and they want to make a difference, they should be allowed.

I can't really sit at home and watch whilst the regime drops barrel bombs on people, on hospitals, on schools. This is against humanity, this is a humanity issue.

– Abu Firas

Firas would not disclose which brigade he was fighting with in Syria, although he revealed that it was not the Islamic State in Iraq and Syria (Isis) - which was a former affiliate of al-Qaeda.

When asked whether he would want Sharia law in Syria, the Briton said he was in the war-torn country to "act as a servant" to the people and not to impose his views on them.

I'm going to Syria to help the Syrians. On whether there should be an Islamic state - that's for the Syrians to decide.

I'm going to be acting like a servant to the Syrians, that's what I'm going for. I don't agree with what's going on in Syria, it's wrong and an Islamic state can be decided by the Syrians themselves.

– Abu Firas

Shiraz Maher, a senior research fellow at the International Centre for the Study of Radicalisation, told ITV News' Lucy Manning that Firas' message was atypical of what other British fighters were saying.

British fighters have tended to say this war is an individual obligation on every Muslim.

[British fighters have said] every Muslim should drop what they're doing right now in Britain and come immediately over to Syria and that they should join some of the more intemperate and violent groups out there.

This guy's message goes really against that, he's saying 'look, there are hot heads out here, there are a lot of people out here who shouldn't really have come out here in the first place and if you're thinking of coming, don't come unless you have something unique and specific that you can add.